use package.json version in lib .version and in minified preamble

Author: nfriedly

index.js

@@ -35,7 +35,7 @@
  *
  * envify automatically rewrites this during the release process
  */
-exports.version = process.env.TRAVIS_BRANCH;
+exports.version = process.env.npm_package_version;
 
 /**
  *

package.json

@@ -12,9 +12,10 @@
     "test-integration": "TEST_MODE=integration karma start --single-run",
     "webpack": "webpack",
     "browserify": "browserify index.js --standalone WatsonSpeech --outfile dist/watson-speech.js --transform envify",
-    "minify": "uglifyjs --source-map --compress --mangle --output dist/watson-speech.min.js --beautify \"beautify=false,preamble='// IBM Watson Speech JavaScript SDK\\n// $TRAVIS_BRANCH\\n// Generated at `date`\\n// Copyright IBM ($npm_package_license)\\n// $npm_package_homepage'\" dist/watson-speech.js",
+    "minify": "uglifyjs --source-map --compress --mangle --output dist/watson-speech.min.js --beautify \"beautify=false,preamble='// IBM Watson Speech JavaScript SDK\\n// $npm_package_version\\n// Generated at `date`\\n// Copyright IBM ($npm_package_license)\\n// $npm_package_homepage'\" dist/watson-speech.js",
     "watchify": "watchify index.js --standalone WatsonSpeech --outfile dist/watson-speech.js --debug --verbose",
     "build": "npm run webpack && npm run minify",
+    "verson": "npm run build",
     "doc": "jsdoc -c scripts/jsdoc/config.json --debug",
     "watch-doc": "nodemon --watch ./ --ignore ./doc --ext js,tmpl,json --exec npm run doc"
   },